Could This Be Movement?

patchen30

I posted on here a few weeks ago about how I was having what felt like muscle twitches or very mild spasms in my abdomen occassionally.  I asked my OB if it could be the baby at my 16w2d appt. and she said it was possible but that most people don't feel movement until about 18w. 

I've been feeling this more in the past few days and it feels stronger...it's like a breif 1 second muscle spasm or twitch (does not feel like butterfly wings and other things people describe)...but it moves around and is a couple inches below my belly button.  If I put my hand on my belly when it's happening I can actually feel it veeery slightly externally - I put DH's hand on there yesterday and he could too.

Is it way too early for this to be movement?  I know it's also possible that it's some kind of weird uterine muscle spasm also due to things stretching/growing.